Adjustable sprinkler



FIG. 1 is a perspective view of an adjustable sprinkler showing my new design;

FIG. 2 is a perspective view thereof, the top portion shown in extended position;

FIG. 3 is a side elevational view thereof, the opposite side being a mirror image;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for an adjustable sprinkler, as shown and described. 